Bite wing technique Flashcards
what is the bite-wing technique?
- a method used to examine the interproximal surfaces of teeth
important terminology **
- interproximal
- interproximal examination
- bite-wing film
- alveolar bone
- crystal bone
- contact areas
- contacts, open
- contacts, overlapped
principles of the bite-wing technique
- film is placed in the mouth parallel to the crowns of both the upper and lower teeth
- the film is stabilized when the patient bites on the bite-wing holder
- the central ray is directed through the contacts of the teeth, using a +10 degree vertical angulation
what is the bite-wing film holder?
- Rinn XCP bite wing instrument
- a device used to position an intramural film in the mouth
what is a bite-wing tab?
- a heavy paperboard tab or loop fitted around a periapical film and used to stabilize the film during exposure
film sizes and what they’re used for in bite-wing technique
- size 0: for posterior teeth of children with primary dentition
- size 1: for the posterior teeth of children with mixed dentitions
- size 2: for posterior teeth of adults, placed horizontally or vertically
- size 3: for bitewings, not recommended for adult patients
what is the angulation of position indicating device?
- the alignment of the central ray of the x-ray beam in the horizontal and vertical planes
what is the correct horizontal angulation?
- the central ray is directed perpendicular to the curvature of the arch and through the contact areas of the teeth
what is the result of incorrect horizontal angulation?
- results in overlapped incorrect horizontal angulation
what is vertical angulation?
- the positioning of the PID in a vertical or up and down plane
what is positive vertical angulation?
- the PID is positioned above the occlusal plane and the central ray is directed downward
what is negative vertical angulation?
- the PID is positioned below the occlusal plane and the central ray is directed upward
what is the correct angle for vertical angulation in the bite-wing technique?
+10 degrees
what does incorrect vertical angulation in the bite wing technique result in?
results in distorted image
rules for bite-wing technique
- film placement
- film positions
- vertical angulation
- horizontal angulation
- film exposure
step-by-step procedures of bite-wing technique
- patient preparation
- equipment preparation
- exposure sequence for film placements
- film placement
patient preparation in the bite-wing technique
- explain the radiographic procedure to the patient
- position the patient upright in the chair
- adjust the headrest
- place and secure the lead apron with thyroid collar
- remove all objects from the mouth
equipment preparation:
- set the exposure factors
- open the sterilized film package containing the film holder if a film holder is used
exposure sequence for film placements
- 2 bite-wing films are typically exposed on each side of the arch
- one bite-wing film may be sufficient when posterior teeth are missing
exposure sequence for film placements in full mouth series
- expose all anterior periapical films first
- follow with posterior periapical films
- finish with bite-wing exposures
exposure sequence for film placements in bite-wings only
- expose the premolar bite-wing film first
- expose the molar bite-wing film last
- film placement is the specific area where the film must be positioned before exposure (dictated by the teeth and surrounding structures)
bite-wing film placement
- the white side of the film faces the teeth
- in the posterior bite-wing series, the films are placed horizontally
- THE IDENTIFICATION DOT HAS NO SIGNIFICANCE IN THE BITE-WING PLACEMENT
- centre the film over the area to be examined
- ask the patient to ‘slowly bite’ on the bite-wing tab or bite-block of the film holder
what are vertical bite-wings used for?
- used to examine the level of alveolar bone
- placed with the long portion of the film in a vertical direction
- seven films are used to cover canine, midline, premolar and molar areas
modifications in the bite-wing technique for edentulous spaces and bony growths
- edentulous spaces: a conn ton roll must be placed in the area of the missing tooth to support the bite-wing tab or film holder
- bony growths: the film must be placed between the tori and the tongue
helpful hints: posterior premolar BW
- see all of mn canine on the film (at least 1/2)
- aim for middle/corner of the eye
- cross the arch with anterior border of film
helpful hints: posterior molar bitewing
- position the bitewing with tongue and 6 or 7
- slowly move back to proper position
- open and close technique
- anterior border of film on 3/4 on mn 5
- watch curve of mn
- ensure film is parallel with teeth vs parallel to midline
helpful hints: cone cutting
- stand directly behind PID
- use your finger to align cone
